The term describes an irritating, or uncomfortable situation where the feeling of unrest and lack of well being festers like a "Bleeding Cock Sore".
You are at a fast food establishment with your friend, and notice two hot women in the queue behind you. Having noticed that the ladies do not appreciate your manly charms, it is concluded that they MUST be a couple - why else would they not be falling over to get your number?
The dawning realization that both women assume that you and your friend are "partners" creates an uncomfortable scenario - the feeling being that of a "Bleeding Cock Sore". A festering, uncomfortable situation that cannot be talked about - unless to a Doctor - and only in the case where there is no other option!!!!